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Volatile compound
Molecular weight
Mean concentration in landfill gas, ppbv
Landfill emissions, kg/million tonnes of MSW
Acetone
58.08
6,838
826
Benzene
78.01
2,057
339
Chlorobenzene
112.56
82
17
Chloroform
119.39
245
61
1,1-Dichloroethane
98.97
2,801
574
Dichloromethane
84.80
25,694
4,539
Diethylene chloride
58.00
2,835
339
Ethyl benzene
106.16
7,334
1,626
Methyl ethyl ketone
72.10
3,092
461
1,1,1-Trichloroethane
133.42
615
174
Trichloroethylene
131.40
2,079
565
Toluene
92.13
34,907
6,704
Tetrachloroethylene
165.85
5,244
1,809
Vinyl chloride
62.50
3,508
461
Styrenes
104.15
1,517
330
Vinyl acetate
62.50
5,663
1,017
Xylenes
106.16
2,651
583
Total VOC emissions


20,435
Ammonia
17.03
550,000
-
Sulphides/mercaptans
60.00
500,000
-

TABLE 4. Gaseous emissions of US landfills